Pneumatic lifting-jack.



No. 794,262. PATENTED JULY l1, 1905.

F. E. TEN EYCK.

PNEUMATIG ILIJFTING JACK.

APPLIGATION FILED 11B. 11. 1905.

2 SHEETS-SHEET 1.

Inventur: l

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No. 794,262. PATENTED JULY 11, 1905. F. E. TEN EYCK.

PNBUMATIC LIPTNG JACK. APPLICATION FILED FEB. 1'1. 1905.

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Patented July 11, 1905.

Barnum @erica FRANK E. TEN EYCK, OF AUBURN, NEW YORK.

PNEUMATHC LIFTING-JACK SPECIFICATION forming part of Letters Patent No.794,262, dated July 11, 1905.

Application tiled February 1l, 1905. Serial No. 245,280.

Be it known that .1. FRANK E. TEN EYCK, a citizen ot' the United States,residing at A uburn, in the county of Cayuga and State of New York, haveinvented certain new and use't'ul ,Improvements in YPneumatic LiftingJacks, of which the `following is a Vt'ull and cxact description.

My invention relates to that class of jacks operated by air or lid uidcompression, and has for its object the production ol a lifting-jackthat will comprise in a small and compact body great power and ease ofoperation and adjustment.

ln 'the drawings, Figure l is an elevation showing the jack closed. Fig.2 is a section and part elevation on the line m :y of Fig. 1. Fig. 3 isa detail section on the line Y Y otl Fig. 1. Fig. 4 is a section andpart elevation showing the operative parts raised. Fig. 5 is a detailsection. Fig. 6 is a detail section on the line 3 3 oli Fig. 5, and Fig.7 is a diagrammatic detail.

A is a cylindrical casing secured to a base B and a cap C.

D isahollowpiston-rod secured at its lower end to a piston E. The pistonE is composed ot plates (l, and a. holding between them a disk made ofleather or other flexible and suitable material, the edge of the diskbeing bent as shown and litting snugly against the inner circumferenceolE the cylinder A. A Afiat spring is employed to preserve the properengagement of the disk with the side ot' the cylinder. The peripherallaces otl the disks a a' are ot considerable breadth in order to add tothe stability otl the jack and to minimixe any tendency otl the parts tolateral movement when in a raised position.

rithin the hollow piston-rod D is a supporting-bar F, having attached toits upper end a bracket Gr, upon which will rest the ob- -iect to beraised. A spring-controlled dog 0 is pivotcd between lugs upon thehollow piston-rod If) and engages with rack-teeth a on a side of thesupporting-bar F to hold the latter in any desired elevated position.

On a side of the piston-rod D is ai-ack-bar C', having inverted teeth0'. r[he rack-bar C may be integral with the piston-rod l) or it may bemade separately and attached thereto in any suitable manner. A dog ispivoted in lugs upon the cap C and is normally out ot' engagement withthe rack-teeth o'. The face e2 of the dog is so shaped that but aminimum ot' its surface ever engages with a face of any of the teeth c'when in contact, as shown in Fig. 7. Consequently while the dog (il willhold the piston-rod l) securely when in use and the piston rod is raisedbut a small amount of pressure is required to release the dog and allowthe piston-rod to descend.

Air is forced into cylinder' A and beneath the piston E through a tubee. connected to an inlet e in the base B. The end ot' the tube eattached to the source of air-supply is provided with an ordinarybicycle-valvef. An air-passagef leads from the inlet e' through the baseB and opens into the cylinder A beneath the piston E. At (l theair-passage j is enlarged to accommodate a valve r/ ot' similarconstruction and operation to the valve f, except that the valve-stem /Lprojects above the casing. lt occasionally happens that the washer /t inthe valve f/ when the valve is opened to exhaust air in the cylinder bypressing on the valve-stem /t will stick to the valve-seat and soprevent the passage of air. lo overcome this dilliculty, l cut away thevalve-stem as shown, so that when the valve-stem /t is pressed down toexhaust air vfrom the cylinder A and the washer should stick against thevalve-seat there will be a sut'- licient space between the edge ot' theopening in the Washer and the cut-away part of the stem /i vto permitthe air to readily escape.

Then it is desired to use the jack, it is first placed beneath theobject to be moved. The supporti ngbar F is raised to the desired heightby hand or until the bracket Gr contacts with the object and is so heldby the dog c engaging with one ofthe teeth a. Air is then pumped throughthe tube e and the passage f into the cylinder A beneath the piston E,raising the latter and the piston-rod fl), carrying with them thesupportingfbar F and the bracket Gr and raising the object with whichthelatter is in contact. flien the desired. height has been reached,thepumping is stopped and the weight of the object raised is sustained bythe cushion of air beneath the piston E. If at any time, however,leakage or other causes should tend to lessen the air in the cylinder,so that the piston will descend and lower the object raised `below thedesired position, the dog Z is tilted into contactwith the. face of thenearest of the .inverted teeth on the piston-rod, and any furtherdownward movement is at once checked. When the object raised is to belowered and the dog d is in engagement with the rack-bar C', the dog dis released, and a pressure of the foot or hand upon the valve-stein Lwill open the valve, allowing the air in the cylinder A to exhaust andthe piston G to descend to its lirst position. rIhe jack can then beremoved from beneath the object with which it has been used, and bydisengaging the dog c from thc teeth a on the supporting-bar Fthe latterwill drop back to its normal place in the pistonrod D.

It will be observed that the slow exhaustion of the air .from thecylinder A because of the small size of the air-passage f permits a slowdescent of the piston and connected parts that sustain the objectraised, preventing all jar or shock caused by a sudden release of theair in large volume. I

The supporting-bar F can be removed entirely from the piston-rod I), andthe latter can be used as a supporting-bar, the top being suflcientlybroad and strong to support the object to be raised.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A lifting-jack having a rack-bar with inverted teeth, and means tocontact with the face of the teeth to hold the rack-bar when the latteris raised.

2. Alifting-jack having a rack-bar with inverted teeth, and a dog tocontact with the face of the teeth to hold the rack-bar when the latteris raised.

3. A lifting-jack having a rack-bar with inverted teeth, and a dog toengage therewith, the face of the dog shaped to present a minimum of itssurface to engage with the face of the teeth on the rack-bar.

4. In a pneumatic lifting-jack, the combination of a cylinder, a pistonin the cylinder, and a piston-rod having a series of rack-teeth.

5. In a pneumatic lifting-jack, the combination of a cylinder, a pistonin the cylinder, and a hollow piston-rod having a series of rack-teeth.

6. In a pneumatic lifting-jack, the combination of a cylinder, a pistonin the cylinder, a piston-rod havingaseries of rack-teeth, and means tocontact with the rack-teeth to hold the piston-rod in a raised position.

7. In a pneumatic lifting-jack, the combination of a cylinder, a pistonin the cylinder, a piston-rod havinga series of rack-teeth, and a' dogto contact with the rack-teeth to hold the piston-rod in a raisedposition.

8. In a pneumatic lifting-jack, the combination of a cylinder, a pistonin the cylinder, a piston-rod having va series of inverted rackteeth,anda dog to contact with the face of said teeth to hold the piston-rod in araised position.

9. In a pneumatic lifting-jack, the combination of a cylinder, a pistonin the cylinder` a hollow piston-rod having aseries of invertedrack-teeth, and a dog to contact with the face of said teeth to hold thepiston in araised position.

10. In a pneumatic lifting-jack, the combination of a cylinder, a pistonin the cylinder, a piston-rod having a series of inverted rackteeth, adog to contact with the face of said teeth, the face of the dog shapedto engage a minimum of its surface with the face of the rack-teeth.

11. A pneumatic lifting-jack having in combination a cylinder, a pistonin the cylinder, a hollow piston-rod, rack-teeth on the pistonrod, asupporting-bar in the piston-rod, teeth on the supporting-bar, and a dogon the piston-rod to engage the teeth on the supportingbar.

12. A pneumatic lifting-jack having in combination a cylinder, a pistonin the cylinder, a hollow piston-rod having a series of rackteeth, asupporting-bar in the piston-rod, teeth on the supporting-bar, and meansto engage with the teeth on the piston-rod and the teeth on thesupporting-har to hold the piston-rod and the supporting-bar in a raisedposition.

13. A pneumatic lifting-jack having in combination a cylinder, a pistonin the cylinder, a hollow piston-rod having a series of rackteeth, avertically-adjustable supporting-bar in the piston-rod, teeth on thesupporting-bar, a dog on the cylinder to contact with the teeth on thepiston-rod, and a dog on the piston-rod to engage with the teeth on thesupportingbar.

14. Apneumatic lifting-jack having in combination a cylinder, a pistonin the cylinder, a hollow piston-rod having a series of invertedrack-teeth, a vertically-ad justable supportingbar in the piston-rod,teeth on the supportingbar, a dog on the cylinder to contact with theface of the teeth on the piston-rod, and a dog on thc piston-rod toengage the teeth on the supporting-bar.

l5. A lifting-jack having in combination a cylinder, a base therefor, apiston in the cylinder, a hollow piston-rod having inverted rack teeth,a cap on the cylinder through which the piston-rod moves, avertically-adjustable supporting-har having rack-teeth, a dog on thepiston-rod to engage said teeth,

IOO

IZO

and a dog on the cap to engage with the teeth In testimony whereof Ihereunto set my on the piston-rod. hand, this 6th day of February, 1905,in the 16. Apneumaticlifting-jaok having in oompresonce of two attestingwitnesses. birmtion a cylinder, a piston in the cylinder, FRANK E. TENEYCK. 5 a. hollow piston-rod having it series of raok- Witnesses:

teeth, a supportngbnr in the piston-rod, and WM. CHAUNCEY GATES,

a supporting-bracket on the supporting-bar. D. L. TULLER.

